Handling data 1
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Transcript of Handling data 1
Handling data 1
BTEOTSSSBAT:Identify quantitative and qualitative data
Display data using bar charts, pie charts and stem and leaf diagrams
Key wordsDiscreteContinuousStem and leaf diagramdatapictogrampie chartbar charttallyfrequency
Types of data
Statistics is a branch of mathematics that is concerned with the collection and interpretation of data.There are different types of data:
Data
Types of data
Statistics is a branch of mathematics that is concerned with the collection and interpretation of data.There are different types of data:
Data
QuantitativeQualitative
Types of data
Statistics is a branch of mathematics that is concerned with the collection and interpretation of data.There are different types of data:
Data
QuantitativeQualitative
Continuous‘measured’
Discrete‘counted’
Now try these 1State whether each of the following is qualitative or quantitative data. If quantitative, state whether it is discrete or continuous.
(a) The number of pupils in a class.(b) The colour of cars in a car park.(c) The time spent by a motorist waiting at a red traffic light.(d) The styles of women’s dresses available in a chain store.(e) The number of votes received by the candidates in an election.(f) The club of each of the members of the England football team.(g) The number of players from a club who play football for England.(h) The mass of a new born baby.(i) The number of words on a page of a book.(j) The duration of a hockey match.
Collecting data
Name Transport Time (mins)1
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Transport Tally Frequency
PictogramA pictogram is a very simple-to-read way of presenting data. It is cheerful and it makes a powerful visual impact.
Bar ChartThe bar chart is easier to draw than a pictogram and allows for greater accuracy. It is best drawn on graph paper.
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Sh irt Co lour
How to draw pie charts
Step 1
Put the information in a table
Eye colour No of people
Blue 5
Green 2
Hazel 2
Grey 1
Total 10
How to draw pie charts
Step 1
Put the information in a table
Eye colour No of people
Blue 5
Green 2
Hazel 2
Grey 1
Total 10
How to draw pie charts
Step 1
Put the information in a table
Step 2
Work out how many degrees for one item360º represent 10 peopleSo 360º ÷ 10 = 36º
36º represent 1 person
Eye colour No of people
Blue 5
Green 2
Hazel 2
Grey 1
Total 10
How to draw pie charts
Step 1
Put the information in a table
Step 2
Work out how many degrees for one item360º represent 10 peopleSo 360º ÷ 10 = 36º
36º represent 1 person
No of degrees
5 x 36º = 180º
2 x 36º = 72º
2 x 36º = 72º
1 x 36º = 36º
360º
Step 3 Write down in the table how many degrees for each item.
How to draw pie charts
Step 5
Draw a circle and draw on the correct angles
How to draw pie charts
Step 5
Draw a circle and draw on the correct angles
Step 6
Label the segments
Grey eyes
Blue eyes
Green eyes
Hazel eyes
Stem and leaf diagramsStem and leaf diagrams are also known as stemplots. They are useful ways of displaying information.
ExampleThese are the results for a module test for 10 students:12 23 34 35 37 55 56 57 68 68
10 220 330 4 5 74050 5 6 760 8 8
We can display this on a stem and leaf diagram.
LeavesStem
Stem and leaf diagramsStem and leaf diagrams are also known as stemplots. They are useful ways of displaying information.
ExampleThese are the results for a module test for 10 students:12 23 34 35 37 55 56 57 68 68
1 22 33 4 5 745 5 6 76 8 8
Stem and leaf diagramsStem and leaf diagrams are also known as stemplots. They are useful ways of displaying information.
ExampleThese are the results for a module test for 10 students:12 23 34 35 37 55 56 57 68 68
1 22 33 4 5 745 5 6 76 8 8
L = 12lowest
Stem and leaf diagramsStem and leaf diagrams are also known as stemplots. They are useful ways of displaying information.
ExampleThese are the results for a module test for 10 students:12 23 34 35 37 55 56 57 68 68
1 22 33 4 5 745 5 6 76 8 8
L = 12
H = 68
Stem and leaf diagramsStem and leaf diagrams are also known as stemplots. They are useful ways of displaying information.
ExampleThese are the results for a module test for 10 students:12 23 34 35 37 55 56 57 68 68
1 22 33 4 5 745 5 6 76 8 8
n = 12
L = 12
H = 71
Stem and leaf diagramsStem and leaf diagrams are also known as stemplots. They are useful ways of displaying information.
ExampleThese are the results for a module test for 10 students:12 23 34 35 37 55 56 57 68 68
1 22 33 4 5 745 5 6 76 8 8
3 3 represents 33 marks
n = 12
L = 12
H = 71
A key
Stem and leaf diagramsStem and leaf diagrams are also known as stemplots. They are useful ways of displaying information.
ExampleThese are the results for a module test for 10 students:12 23 34 35 37 55 56 57 68 68